As long as you have two drops of blood in you that is from one of the heavy recruited minority group, you can be considered as a minority!! Remember, you must have at least TWO drops of minority blood, not one!!! You do not have to be full blooded American Indian for example to be considered to be an American Indian!
As far as advantages goes in the application process, obviously if you have high academic numbers and a great experienced background, you will be mashed into with the rest of the applicant pool. If your academic is STRONG, you will get in no matter what your ethinicity is!! Also in this type situation where you are a strong applicant, your ethinicity will be noted and you will mostly likely be chosen to be accepted if you were to compete with a Caucasian or an Asian applicant that has the exact same academic credentials.
I strongly believe that being from a minority group, the advantage will be more noticeable "IF" your academic numbers are below the average within the applicant pool! For example, while normal standards for cumulative GPA is a 3.0 for Caucasian and Asian applicants, the standard cumulative GPA for a minority applicant is a 2.8 (hypothetically) just to increase minority enrollment!
Bottom line, minority applicants are heavily recruited now and it will increase as the years goes on. If given two applicants with the same academic numbers and one of them is a minority applicant and the other is a Caucasian or an Asian applicant, the minority applicant will recieve a higher recognition and attention due to the big push to recruit minority applicants! If you have a lower GPA and DAT scores (but still presentable) AND you're a minority, your admission chances are greater than a Caucasian or an Asian applicant with the same numbers.
Also should be noted, minority recruitment is dearly heavy emphasized at certain dental schools while it is not in others. Some dental schools has summer programs for minority applicants to better their admission chances, but most dental schools do not have such programs!
I'm not sure if Arabics are considered as minorities, but do not quote me on this. I know for a fact that follow ethinicity groups are considered minority groups according to ADEA:
Hispanics
American Indians
African Americans
Factors that "MAY" help you in the application process to be in a minority group:
Women
Socio-economical disadvantage background
First generation college graduate
For sure NOT considered as minorities:
Asians
Caucasians
A guy that drives a Porche from Beverly Hills